Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Bancorp's Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Modifications
With an ALLL		$ 304	$ 382
No Related ALLL		223	482
Total		527	864
Loans and leases held for sale	[1]	4,415	4,741
Total portfolio loans and leases	[2],[3]	112,050	108,782
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		15	6
Nonperforming | Government Insured
Financing Receivable, Modifications
Total portfolio loans and leases		26	29
Restructured nonaccrual loans and leases		11	17
Commercial
Financing Receivable, Modifications
With an ALLL		192	274
No Related ALLL		145	364
Total		337	638
Interest Income Recognized		7	10
Total portfolio loans and leases		70,268	68,997
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		151	213
No Related ALLL		128	260
Total		279	473
Interest Income Recognized		6	8
Loans and leases held for sale		7	230
Total portfolio loans and leases		51,659	49,665
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		10	20
No Related ALLL		13	60
Total		23	80
Total portfolio loans and leases		4,709	4,675
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		22	34
No Related ALLL		3	43
Total		25	77
Interest Income Recognized		0	1
Total portfolio loans and leases		5,607	5,927
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		6	1
No Related ALLL		0	0
Total		6	1
Total portfolio loans and leases		5,241	5,815
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		3	6
No Related ALLL		1	1
Total		4	7
Interest Income Recognized		1	1
Loans and leases held for sale		1	39
Total portfolio loans and leases		3,052	2,915
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		14	11
No Related ALLL		19	49
Total		33	60
Interest Income Recognized		24	28
Consumer
Financing Receivable, Modifications
With an ALLL		98	97
No Related ALLL		30	39
Total		128	136
Interest Income Recognized		12	13
Total portfolio loans and leases		41,782	39,785
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		53	55
No Related ALLL		24	31
Total		77	86
Interest Income Recognized		7	9
Total portfolio loans and leases		4,084	5,183
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		77	86
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		21	8
No Related ALLL		6	8
Total		27	16
Interest Income Recognized		2	0
Total portfolio loans and leases		16,783	13,653
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		27	16
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		23	32
No Related ALLL		0	0
Total		23	32
Interest Income Recognized		3	4
Total portfolio loans and leases		1,766	2,007
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		23	32
Consumer | Other consumer loans:
Financing Receivable, Modifications
With an ALLL		1	2
No Related ALLL		0	0
Total		1	2
Total portfolio loans and leases		2,752	3,014
Consumer | Other consumer loans: | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		1	2
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		304	382
No Related ALLL		194	452
Total		498	834
Interest Income Recognized		43	51
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		29	30
Total		$ 29	$ 30

[1] Includes $1,023 and $1,481 of residential mortgage loans held for sale measured at fair value at December 31, 2021 and 2020, respectively.

[2] Includes $154 and $161 of residential mortgage loans measured at fair value at December 31, 2021 and 2020, respectively.

[3] Includes $24 and $55 of other short-term investments, $322 and $756 of portfolio loans and leases, $(2) and $(7) of ALLL, $2 and $5 of other assets, $1 and $2 of other liabilities and $263 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2021 and 2020, respectively. For further information, refer to Note 12.